function dame(eve){
if(document.all){
if(event.button == 2){
alert("いや〜ん！");
return false;
}
}
if(document.layers){
if(eve.which == 3){
alert("いや〜ん！");
return false;
}
}
}
if(document.layers)document.captureEvents(Event.MOUSEDOWN);
document.onmousedown=dame;